package com.atguigu.gulimall.search.service.impl;
import com.alibaba.fastjson.JSON;
import com.atguigu.common.to.es.SkuEsModel;
import com.atguigu.gulimall.search.config.GulimallElasticSearchConfig;
import com.atguigu.gulimall.search.constant.EsConstant;
import com.atguigu.gulimall.search.service.MallSearchService;
import com.atguigu.gulimall.search.vo.SearchParam;
import com.atguigu.gulimall.search.vo.SearchResult;
import org.apache.lucene.search.join.ScoreMode;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.NestedQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.RangeQueryBuilder;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.Aggregation;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.Aggregations;
import org.elasticsearch.search.aggregations.bucket.nested.NestedAggregationBuilder;
import org.elasticsearch.search.aggregations.bucket.nested.ParsedNested;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedLongTerms;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedStringTerms;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.thymeleaf.util.StringUtils;

import javax.swing.*;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;

@Service
public class MallSearchServiceImpl implements MallSearchService {

    @Autowired
    private RestHighLevelClient client;

    @Override
    public SearchResult search(SearchParam param) {

        SearchResult searchResult=null;
        SearchResult result;

        //es要求的封装SearchRequest
        SearchRequest searchRequest = buildSearchRequest(param);

        SearchResponse response = null;

        try {

            response = client.search(searchRequest, GulimallElasticSearchConfig.COMMON_OPTIONS);
            System.out.println(response.toString());
            result = buildSearchResult(response,param);

        } catch (IOException e) {
            throw new RuntimeException(e);
        }

        return result;
    }

    private SearchResult buildSearchResult(SearchResponse response , SearchParam param) {

        SearchResult result = new SearchResult();

        //1、查询到的商品
        SearchHits hits = response.getHits();

        List<SkuEsModel> esModelList = new ArrayList<>();

        if(hits != null && hits.getHits().length > 0) {
            for (SearchHit hit : hits.getHits()) {
                String sourceAsString = hit.getSourceAsString();
                //将查询到的全部内容转为原始传进去的类型
                SkuEsModel esModel = JSON.parseObject(hit.getSourceAsString(), SkuEsModel.class);
                if(!StringUtils.isEmpty((param.getKeyword()))){
                    HighlightField skuTitle = hit.getHighlightFields().get("skuTitle");
                    String string = skuTitle.getFragments()[0].string();
                    esModel.setSkuTitle(string);
                }
                esModelList.add(esModel);
            }
        }
        result.setProducts(esModelList);

        //1、获取属性
        List<SearchResult.AttrVo> attrVos = new ArrayList<>();
        ParsedNested attr_agg = response.getAggregations().get("attr_agg");
        ParsedLongTerms attr_id_agg = attr_agg.getAggregations().get("attr_id_agg");
        for (Terms.Bucket bucket : attr_id_agg.getBuckets()) {

            SearchResult.AttrVo attrVo = new SearchResult.AttrVo();
            //id
            long l = bucket.getKeyAsNumber().longValue();
            attrVo.setAttrId(l);
            //name
            ParsedStringTerms attr_name_agg = bucket.getAggregations().get("attr_name_agg");
            String keyAsString = attr_name_agg.getBuckets().get(0).getKeyAsString();
            attrVo.setAttrName(keyAsString);
            //value
            List<String> attrValues = ((ParsedStringTerms) bucket.getAggregations().get("attr_value_agg")).getBuckets().stream().map(item -> {
                String keyAsString1 = ((Terms.Bucket) item).getKeyAsString();
                return keyAsString1;
            }).collect(Collectors.toList());

            attrVo.setAttrValue(attrValues);

            attrVos.add(attrVo);  //拿到多个attr
        }

        result.setAttrs(attrVos);

        //2、品牌
        ParsedLongTerms brand_agg = response.getAggregations().get("brand_agg");
        List<SearchResult.BrandVo> brandVos = new ArrayList<>();
        List<? extends Terms.Bucket> brand_Buckets = brand_agg.getBuckets();
        for (Terms.Bucket bucket : brand_Buckets ) {

            SearchResult.BrandVo brandVo = new SearchResult.BrandVo();

            //id
            long brandId = bucket.getKeyAsNumber().longValue();
            brandVo.setBrandId(brandId);

            //name
            ParsedStringTerms brand_name_agg = bucket.getAggregations().get("brand_name_agg");
            String brand_name = brand_name_agg.getBuckets().get(0).getKeyAsString();
            brandVo.setBrandName(brand_name);

            //img
            ParsedStringTerms brand_img_agg = bucket.getAggregations().get("brand_img_agg");
            String brand_img = brand_img_agg.getBuckets().get(0).getKeyAsString();
            brandVo.setBrandImg(brand_img);
            brandVos.add(brandVo);

        }
        result.setBrands(brandVos);

        //分类信息
        ParsedLongTerms catalog_agg = response.getAggregations().get("catalog_agg");
        List<SearchResult.CatalogVo> catalogVos = new ArrayList<>();
        List<? extends Terms.Bucket> buckets = catalog_agg.getBuckets();
        for (Terms.Bucket bucket : buckets) {
            SearchResult.CatalogVo catalogVo = new SearchResult.CatalogVo();

            String keyAsString = bucket.getKeyAsString();
            catalogVo.setCatalogId(Long.parseLong(keyAsString));

            ParsedStringTerms catalog_name_agg = bucket.getAggregations().get("catalog_name_agg");
            String catalog_name = catalog_name_agg.getBuckets().get(0).getKeyAsString();
            catalogVo.setCatalogName(catalog_name);

            catalogVos.add(catalogVo);
        }
        result.setCatalogs(catalogVos);

        //页码
        result.setPageNum(param.getPageNum());

        //总记录数
        long total = hits.getTotalHits().value;
        result.setTotal(total);

        int totalPages = (int)total % EsConstant.PRODUCT_pageSize == 0 ? ((int)total/EsConstant.PRODUCT_pageSize) : ((int)total/EsConstant.PRODUCT_pageSize+1);
        result.setTotalPages(totalPages);

        List<Integer> pageNavs = new ArrayList<>();
        for(int i=1;i<=totalPages;i++){
            pageNavs.add(i);
        }
        result.setPageNavs(pageNavs);

        return result;
    }

    private SearchRequest buildSearchRequest(SearchParam param) {

        //所有检索请求的构建都要通过sourceBuilder来做
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();

        //1\构建bool-query,QueryBuilders,工具类建立各种条件的buliders
        BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();
        //1.1 must模糊匹配
        if(!StringUtils.isEmpty(param.getKeyword())){
            boolQuery.must(QueryBuilders.matchQuery("skuTitle",param.getKeyword()));
        }
        //1.2 bool-filter
        //三级分类
        if((param.getCatelog3Id() != null)){
            boolQuery.filter(QueryBuilders.termQuery("catalogId",param.getCatelog3Id()));
        }
        //品牌id
        if(param.getBrandId()!=null && param.getBrandId().size()>0){
            boolQuery.filter(QueryBuilders.termsQuery("brandId",param.getBrandId()));
        }

        //属性查询,先构建一个nestedQuery,再奉封装查询条件
        if(param.getAttrs() != null && param.getAttrs().size()>0){
            //attrs=1_5寸:8寸&attrs=2_16G:8G

            for (String attrStr : param.getAttrs()) {

                BoolQueryBuilder nestBoolQuery = QueryBuilders.boolQuery();
                //attr=1_5寸:8寸;
                String[] s = attrStr.split("_");
                String attrId = s[0];
                String[] attrValues = s[1].split(":");
                nestBoolQuery.must(QueryBuilders.termQuery("attrs.attrId",attrId));    //term查询单个条件
                nestBoolQuery.must(QueryBuilders.termsQuery("attrs.attrValue",attrValues));   //terms查询多个条件

                //将每种属性的Query条件都放入nestedQuery
                NestedQueryBuilder nestedQuery = QueryBuilders.nestedQuery("attrs", nestBoolQuery, ScoreMode.None);
                boolQuery.filter(nestedQuery);
            }
        }

        //库存查询
        if(param.getHasStock()!=null) {
            boolQuery.filter(QueryBuilders.termQuery("hasStock", param.getHasStock() == 1));
        }
        //按照价格区间
        if(!StringUtils.isEmpty(param.getSkuPrice())){
            RangeQueryBuilder rangeQuery = QueryBuilders.rangeQuery("skuPrice");
            String[] s = param.getSkuPrice().split("_");
            System.out.println(Arrays.toString(s));
            if(s.length == 2){
                rangeQuery.gte(s[0]).lte(s[1]);
            } else if (s.length==1) {
                if(param.getSkuPrice().startsWith("_")) {
                    rangeQuery.lte(s[0]);
                }
                if(param.getSkuPrice().endsWith("_")) {
                    rangeQuery.gte(s[0]);
                }
            }
            boolQuery.filter(rangeQuery);
        }

        //将所有的Query条件进行封装
        sourceBuilder.query(boolQuery);

        //2.1排序分页高亮  sort = hotScore_asc/desc
        if(!StringUtils.isEmpty(param.getSort())){
            String[] s = param.getSort().split("_");
            SortOrder order = s[1].equalsIgnoreCase("ASC") ? SortOrder.ASC : SortOrder.DESC;
            sourceBuilder.sort(s[0],order);    //按哪个字段排序和排序方式
        }


        //分页 from = pageSize * (pageNum-1)
        sourceBuilder.from(EsConstant.PRODUCT_pageSize*(param.getPageNum()-1));
        sourceBuilder.size(EsConstant.PRODUCT_pageSize);

        //高亮
        if(!StringUtils.isEmpty(param.getKeyword())){

            HighlightBuilder builder = new HighlightBuilder();

            builder.preTags("<b style='color:red'>");
            builder.postTags("</b>");
            builder.field("skuTitle");
            sourceBuilder.highlighter(builder);
        }

        //聚合
        // 1、brand聚合
        TermsAggregationBuilder brand_agg = AggregationBuilders.terms("brand_agg").field("brandId").size(50);
        brand_agg.subAggregation(AggregationBuilders.terms("brand_name_agg").field("brandName").size(1));
        brand_agg.subAggregation(AggregationBuilders.terms("brand_img_agg").field("brandImg").size(1));
        sourceBuilder.aggregation(brand_agg);
        //2、分类聚合
        TermsAggregationBuilder catalog_agg = AggregationBuilders.terms("catalog_agg").field("catalogId").size(20);
        catalog_agg.subAggregation(AggregationBuilders.terms("catalog_name_agg").field("catalogName").size(1));
        sourceBuilder.aggregation(catalog_agg);

        //3、属性聚合
        NestedAggregationBuilder attr_agg = AggregationBuilders.nested("attr_agg", "attrs");
        //id
        TermsAggregationBuilder attr_id_agg = AggregationBuilders.terms("attr_id_agg").field("attrs.attrId"); //一个attr_id的聚合有多个attr_id_agg
        //attrName
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_name_agg").field("attrs.attrName").size(1));
        //attrValue
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_value_agg").field("attrs.attrValue").size(50));

        attr_agg.subAggregation(attr_id_agg);
        sourceBuilder.aggregation(attr_agg);

        String s = sourceBuilder.toString();
        System.out.println(s);

        SearchRequest searchRequest = new SearchRequest(new String[]{EsConstant.PRODUCT_INDEX}, sourceBuilder);

        return searchRequest;

    }
}

